Victron 5kVA 48V Off-Grid Energy System with 16.1kWh LiFePO₄ Battery and 5.5kW Generator - No Solar Required

    
By Victron Energy
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Victron 5kVA 48V Off-Grid Energy System with 16.1kWh LiFePO₄ Battery and 5.5kW Generator – No Solar Required

  • Run suitable off-grid loads without solar panels: the battery supplies power between generator charging sessions.
  • Victron MultiPlus-II inverter-charger provides 230V pure sine wave power, rated at 5kVA / 4kW continuously at 25°C.
  • Store 16.1kWh of nominal energy in a Fogstar LiFePO₄ battery, with PowerControl and PowerAssist to manage a compatible generator supply.

Battery and generator power without a solar array

The system comprises:

With 16.1kWh of battery storage and 5kVA of continuous power, this system is ideal for keeping a business running in off-grid or backup scenarios. It can support equipment, tools, lighting, and other essential systems. It’s also well suited to off-grid homes, with enough capacity to run everyday appliances and heavier loads like washing machines and water pumps.

In fact, one of the Victron MultiPlus-II inverter core design functions is acting as a powerful AC battery charger. When a generator is running and connected to the inverter's AC input, the MultiPlus-II will automatically synchronize with the generator's power, pass that power through to run your household loads, and use any leftover capacity to charge your battery bank.

The price includes a basic set of cables, protection disconnectors, and accessories required to create a fully operational system. User manuals and a connection diagram will be supplied with your order. Mounting not included – if you require a mounting system, contact us for advice.

Key features

  • No solar required: operate as a generator-charged battery system where roof space, shading, seasonal use or site restrictions make solar unsuitable.
  • Battery-powered operation between charging sessions: reduce the need to run the generator continuously, subject to the load profile and available battery energy.
  • Generator load management: PowerControl limits AC input demand, while PowerAssist can supplement an accepted generator supply with battery power during suitable short-term load peaks.
  • Substantial lithium storage: one 51.2V, 314Ah Fogstar battery provides 16,076.8Wh nominal energy, with a PACE 200A BMS, built-in heating and a 2A active balancer.
  • Expandable monitoring: Victron GX for system monitoring, battery integration and remote access through the free VRM platform. 

Where to use

Consider this system for remote offices, rural workshops, cabins, seasonal accommodation, agricultural outbuildings and selected logistics-site loads where a grid connection or solar installation is impractical. Check daily energy demand and equipment starting currents before choosing the system.

How the system works

With the generator stopped, the inverter converts battery DC power into 230V AC. When a generator is running and its output is accepted, the MultiPlus-II can supply loads and charge the battery, within the configured AC input and charging limits.

“No solar required” does not mean no energy input is required: the generator must replenish the battery. Runtime and generator operating hours depend on demand, battery limits, charging settings and generator performance. No fixed runtime or fuel-saving percentage is guaranteed.

Technical specifications

Inverter figures follow the attached MultiPlus-II datasheet’s 48/5000/70-50 model. Battery figures follow the attached Fogstar Energy IP-rated 16.1kWh specification sheet. Generator-specific specifications will be added once its model is confirmed.

Specification Value
System configuration
System type Single-phase, generator-charged off-grid battery system
Inverter-charger Victron MultiPlus-II 48/5000/70-50, 230V
Battery Fogstar Energy IP65-rated 16.1kWh LiFePO₄ battery
Nominal battery voltage 51.2V; compatible 48V-class system
Nominal battery capacity 314Ah
Nominal stored energy 16.1kWh
Proposed generator rating 5.5kW-class continuous 
Victron inverter output
Continuous apparent power at 25°C 5,000VA
Continuous active power at 25°C 4,000W
Peak inverter power 9,000W
Output voltage 230V AC ±2%
Output frequency 50Hz ±0.1%
Output waveform Pure sine wave
DC input range 38–66V DC
Maximum inverter efficiency 96%
AC transfer Less than 20ms
Generator input and battery charging
Accepted AC input-voltage range 187–265V AC
Accepted AC input-frequency range 45–65Hz
Maximum inverter AC input current 50A
Transfer-switch rating 50A
Maximum battery charge current 70A 25°C ambient
PowerControl Limits input demand and reduces charging to avoid overloading the configured AC source
PowerAssist Supplements an accepted AC source with battery power when enabled and correctly configured
AC output 1 Main inverter-backed output
AC output 2 Auxiliary output available only when accepted AC input is present
Programmable relay Configurable for alarm, DC undervoltage or generator start/stop functions
Relay contact ratings 230V AC / 4A; DC 4A up to 35V or 1A up to 60V
Automatic generator control Requires a suitable generator control interface and commissioning
Victron monitoring, construction and environment
Communication VE.Bus for system integration, monitoring and compatible parallel/three-phase configurations
General-purpose communication ports 2
Remote on/off Supported
Remote monitoring Cerbo GX and internet connection provide access to the free Victron VRM platform
Optional external AC current sensor 50A or 100A, as applicable to the configured installation
Cooling Fan-assisted
Operating temperature −40°C to +65°C; output derating applies
Maximum humidity 95%, non-condensing
Inverter protection category IP22
Battery terminals M8 bolts
230V AC connections Screw terminals accepting up to 13mm² / 6AWG
Inverter dimensions, H × W × D 565 × 320 × 149mm
Inverter weight 30kg
Inverter protections Output short circuit, overload, high/low battery voltage, overtemperature, external AC at inverter output and excessive DC input ripple
Victron standards and warranty
Safety standards listed in attached datasheet EN-IEC 60335-1; EN-IEC 60335-2-29; EN-IEC 62109-1; EN-IEC 62109-2
Emission and immunity standards listed EN 55014-1; EN 55014-2; EN-IEC 61000-3-2; EN-IEC 61000-3-3; IEC 61000-6-1, -6-2 and -6-3
Victron standard warranty 5 years
Fogstar battery electrical specifications
Chemistry LiFePO₄
Rated voltage 51.2V
Nominal / minimum capacity 314Ah / 314Ah
Total rated energy 16,076.8Wh
Battery management system PACE 200A
Maximum charging current 70A
Maximum discharge current 200A
Maximum charging voltage / listed bulk setting 57.6V
Listed float setting 55.2V
Listed low DC cut-off 43.2V
Active balancing 2A
Integrated breaker 250A
Communication ports CAN, RS485 and RS232
Preloaded inverter protocols Includes Victron and other low-voltage inverter protocols
Protocol selection Through the battery LCD touchscreen
Parallel expansion Up to 15 compatible batteries
Series connection Not permitted
Fogstar battery environment, construction and service life
Battery ingress protection IP65
Discharge-temperature range −20°C to +60°C
Charging-temperature range stated in sheet −20°C to +45°C with heater enabled
Heating behaviour Integrated heating activates below 5°C
Storage temperature, one month −20°C to +60°C
Storage temperature, one year 0°C to +35°C
Relative humidity 45–85%
Battery dimensions, L × W × H 500 × 232 × 915mm
Battery weight 128.8kg; plan suitable lifting and handling equipment
Published cycle-life statement 8,000 cycles at 80% depth of discharge
Design life 15 years
Built-in fire-suppression unit Aerosol unit with stated activation at 170°C; does not eliminate fire risk or replace installation safeguards
Battery warranty 10 years
Accessories  Pair of 1.5m battery cables with Amphenol connectors; 1.5m RS485/CAN communication cable; 1.8m PC cable
Generator and final system confirmation
Generator selection 5.5kW-class unit
Complete system ingress protection Not established by the battery’s IP65 rating; each component requires its own suitable location

Documents available for download

Shipping

Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide. If a shipping rate is not shown at checkout, contact us on +44 20 8064 0335 or info@energian.co.uk for a quote.

UK expert support

Energian’s UK team can help assess loads, battery capacity, generator selection and installation requirements. Contact us by phone, email or live chat with questions or support requests, or arrange an in-person consultation at our office. Installation can be arranged through trusted partners.